Tuesday night's highlights, 7/21/09

"Ruby and the Rockits" (7:30 p.m., ABC Family): The show rates only two stars, but the premiere is still worth watching for two reasons: 1. Brothers David and Patrick Cassidy co-star, and brother Shaun writes for it. (You missed your chance to watch David's hot daughter Katie -- she starred in "Harper's Island" -- but maybe she'll cameo.) 2. David and Patrick play former '80s pop stars, so there will be parachute pants jokes.

"Medium" (9 p.m., WBBM-Channel 2): Patricia Arquette settles in for her first night on CBS.